/*
Copyright 2024 The Karmada Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package daemonset

import (
	apps "k8s.io/api/apps/v1"
	v1 "k8s.io/api/core/v1"
	"k8s.io/client-go/kubernetes"

	"github.com/karmada-io/dashboard/pkg/common/errors"
	"github.com/karmada-io/dashboard/pkg/common/types"
	"github.com/karmada-io/dashboard/pkg/dataselect"
	"github.com/karmada-io/dashboard/pkg/resource/common"
	"github.com/karmada-io/dashboard/pkg/resource/event"
)

// DaemonSetList contains a list of Daemon Sets in the cluster.
type DaemonSetList struct {
	ListMeta   types.ListMeta        `json:"listMeta"`
	DaemonSets []DaemonSet           `json:"daemonSets"`
	Status     common.ResourceStatus `json:"status"`

	// List of non-critical errors, that occurred during resource retrieval.
	Errors []error `json:"errors"`
}

// DaemonSet plus zero or more Kubernetes services that target the Daemon Set.
type DaemonSet struct {
	ObjectMeta          types.ObjectMeta `json:"objectMeta"`
	TypeMeta            types.TypeMeta   `json:"typeMeta"`
	Pods                common.PodInfo   `json:"podInfo"`
	ContainerImages     []string         `json:"containerImages"`
	InitContainerImages []string         `json:"initContainerImages"`
}

// GetDaemonSetList returns a list of all Daemon Set in the cluster.
func GetDaemonSetList(client kubernetes.Interface, nsQuery *common.NamespaceQuery, dsQuery *dataselect.DataSelectQuery) (*DaemonSetList, error) {
	channels := &common.ResourceChannels{
		DaemonSetList: common.GetDaemonSetListChannel(client, nsQuery, 1),
		ServiceList:   common.GetServiceListChannel(client, nsQuery, 1),
		PodList:       common.GetPodListChannel(client, nsQuery, 1),
		EventList:     common.GetEventListChannel(client, nsQuery, 1),
	}

	return GetDaemonSetListFromChannels(channels, dsQuery)
}

// GetDaemonSetListFromChannels returns a list of all Daemon Set in the cluster
// reading required resource list once from the channels.
func GetDaemonSetListFromChannels(channels *common.ResourceChannels, dsQuery *dataselect.DataSelectQuery) (*DaemonSetList, error) {
	daemonSets := <-channels.DaemonSetList.List
	err := <-channels.DaemonSetList.Error
	nonCriticalErrors, criticalError := errors.ExtractErrors(err)
	if criticalError != nil {
		return nil, criticalError
	}

	pods := <-channels.PodList.List
	err = <-channels.PodList.Error
	nonCriticalErrors, criticalError = errors.AppendError(err, nonCriticalErrors)
	if criticalError != nil {
		return nil, criticalError
	}

	events := <-channels.EventList.List
	err = <-channels.EventList.Error
	nonCriticalErrors, criticalError = errors.AppendError(err, nonCriticalErrors)
	if criticalError != nil {
		return nil, criticalError
	}

	dsList := toDaemonSetList(daemonSets.Items, pods.Items, events.Items, nonCriticalErrors, dsQuery)
	dsList.Status = getStatus(daemonSets, pods.Items, events.Items)
	return dsList, nil
}

func toDaemonSetList(daemonSets []apps.DaemonSet, pods []v1.Pod, events []v1.Event, nonCriticalErrors []error,
	dsQuery *dataselect.DataSelectQuery) *DaemonSetList {
	daemonSetList := &DaemonSetList{
		DaemonSets: make([]DaemonSet, 0),
		ListMeta:   types.ListMeta{TotalItems: len(daemonSets)},
		Errors:     nonCriticalErrors,
	}

	dsCells, filteredTotal := dataselect.GenericDataSelectWithFilter(ToCells(daemonSets),
		dsQuery)
	daemonSets = FromCells(dsCells)
	daemonSetList.ListMeta = types.ListMeta{TotalItems: filteredTotal}

	for _, daemonSet := range daemonSets {
		daemonSetList.DaemonSets = append(daemonSetList.DaemonSets, toDaemonSet(daemonSet, pods, events))
	}

	return daemonSetList
}

func toDaemonSet(daemonSet apps.DaemonSet, pods []v1.Pod, events []v1.Event) DaemonSet {
	matchingPods := common.FilterPodsByControllerRef(&daemonSet, pods)
	podInfo := common.GetPodInfo(daemonSet.Status.CurrentNumberScheduled, &daemonSet.Status.DesiredNumberScheduled, matchingPods)
	podInfo.Warnings = event.GetPodsEventWarnings(events, matchingPods)

	return DaemonSet{
		ObjectMeta:          types.NewObjectMeta(daemonSet.ObjectMeta),
		TypeMeta:            types.NewTypeMeta(types.ResourceKindDaemonSet),
		Pods:                podInfo,
		ContainerImages:     common.GetContainerImages(&daemonSet.Spec.Template.Spec),
		InitContainerImages: common.GetInitContainerImages(&daemonSet.Spec.Template.Spec),
	}
}
